Daikin RXM18VVJU User manual

Brand: Daikin

Model: RXM18VVJU

Category: Split-system air conditioners

Type: User manual

Daikin RXM18VVJU is a split air conditioner system that offers efficient cooling and heating solutions for residential and commercial spaces. With its advanced features and versatile functionality, it ensures optimal comfort and energy savings:

Powerful Cooling and Heating: Delivers efficient cooling during hot summers and provides reliable heating during cold winters, maintaining a comfortable indoor climate year-round.
Energy-Saving Operation: Utilizes energy-efficient technology to minimize power consumption while delivering effective cooling and heating performance.
Quiet Operation: Operates quietly, ensuring minimal noise disturbance, making it suitable for bedrooms, offices, and other noise-sensitive environments.

Powerful Cooling and Heating: Delivers efficient cooling during hot summers and provides reliable heating during cold winters, maintaining a comfortable indoor climate year-round.
Energy-Saving Operation: Utilizes energy-efficient technology to minimize power consumption while delivering effective cooling and heating performance.
Quiet Operation: Operates quietly, ensuring minimal noise disturbance, making it suitable for bedrooms, offices, and other noise-sensitive environments.

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MODELS

RXM18VVJU

RXM24VVJU

DAIKIN ROOM AIR CONDITIONER

INSTALLATION MANUAL

R32 Split Series

Installation manual

Manuel dinstallation

Manual de instalación

Manuel dinstallation

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Contents

Safety Considerations .................................... 1

Accessories ..................................................... 3

Precautions for Selecting a Location ........... 3

Precautions on Installation ............................ 4

Outdoor Unit Installation Diagram ................ 4

Installation Space Requirements .................. 5

Outdoor Unit Installation ................................ 5

1. Installing the outdoor unit ............................................ 5

2. Drain work ................................................................... 5

3. Flaring the pipe end ..................................................... 6

4. Refrigerant piping ........................................................ 6

5. Pressure test and evacuating system .......................... 7

Wiring ............................................................... 9

Facility Setting

(cooling at low outdoor temperature) ........... 10

When attaching the drain pan heater ............ 11

Pump Down Operation ................................... 11

Trial Operation and Testing ............................ 12

1. Trial operation and testing ........................................... 12

2. Test items .................................................................... 12

Safety Considerations

Refer also to the General Safety Considerations in the

separate booklet.

Read the precautions in this manual

carefully before operating the unit.

This appliance is lled with R32.

Read these Safety Considerations for Installation carefully

before installing an air conditioner or heat pump. After completing

the installation, make sure that the unit operates properly during

the startup operation.

Instruct the user on how to operate and maintain the unit.

Inform users that they should store this installation manual with

the operation manual for future reference.

Always use a licensed installer or contractor to install this product.

Improper installation can result in water or refrigerant leakage,

electric shock, re, or explosion.

Meanings of DANGER, WARNING, CAUTION, and NOTE

Symbols:

DANGER ........... Indicates an imminently hazardous

situation which, if not avoided, will

result in death or serious injury.

WARNING ......... Indicates a potentially hazardous

situation which, if not avoided, could

result in death or serious injury.

CAUTION .......... Indicates a potentially hazardous

situation which, if not avoided, may

result in minor or moderate injury.

It may also be used to alert against

unsafe practices.

NOTE ................ Indicates situations that may result

in equipment or property-damage

accidents only.

DANGER

• Refrigerant gas is heavier than air and replaces oxygen.

A massive leak can lead to oxygen depletion, especially

in basements, and an asphyxiation hazard could occur

leading to serious injury or death.

•

Do not ground units to water pipes, gas pipes, telephone

wires, or lightning rods as incomplete grounding can cause

a severe shock hazard resulting in severe injury or death.

Additionally, grounding to gas pipes could cause a gas leak

and potential explosion causing severe injury or death.

• If refrigerant gas leaks during installation, ventilate the

area immediately. Refrigerant gas may produce toxic gas

if it comes into contact with re. Exposure to this gas could

cause severe injury or death.

• After completing the installation work, check that the

refrigerant gas does not leak throughout the system.

• Do not install unit in an area where ammable materials

are present due to risk of explosions that can cause

serious injury or death.

• Safely dispose all packing and transportation materials

in accordance with federal/state/local laws or ordinances.

Packing materials such as nails and other metal or

wood parts, including plastic packing materials used for

transportation may cause injuries or death by suffocation.

WARNING

•

Only qualied personnel licensed or certied in their jurisdiction

must carry out the installation work. Installation must be done in

accordance with this installation manual. Improper installation

may result in water leakage, electric shock, or re.

• Pipe work and installation shall be in compliance with

national codes (ASHRAE15 or IRC).

•

When installing the unit in a small room, take measures to keep

the refrigerant concentration from exceeding allowable safety

limits. Excessive refrigerant leaks, in the event of an accident in

a closed ambient space, can lead to oxygen deciency.

• Use only specied accessories and parts for installation

work. Failure to use specied parts may result in water

leakage, electric shock, re, or the unit falling.

• Install the air conditioner or heat pump on a foundation

strong enough that it can withstand the weight of the unit.

A foundation of insufcient strength may result in the unit

falling and causing injuries.

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• Take into account strong winds, typhoons, or earthquakes

when installing. Improper installation may result in the unit

falling and causing accidents.

• Make sure that a separate power supply circuit is provided

for this unit and that all electrical work is carried out by

qualied personnel licensed or certied in their jurisdiction

according to local, state, and national regulations. An

insufcient power supply capacity or improper electrical

construction may lead to electric shock or re.

•

Make sure that all wiring is secured, that specied wires are

used, and that no external forces act on the terminal connections

or wires. Improper connections or installation may result in re.

• When wiring, position the wires so that the electrical

wiring box cover can be securely fastened. Improper

positioning of the electrical wiring box cover may result in

electric shock, re, or the terminals overheating.

• Before touching electrical parts, turn off the unit.

•

The circuit must be protected with safety devices in

accordance with local and national codes, i.e. a circuit breaker.

•

Securely fasten the outdoor unit terminal cover (panel). If the

terminal cover/panel is not installed properly, dust or water

may enter the outdoor unit causing re or electric shock.

•

When installing or relocating the system, keep the refrigerant

circuit free from substances other than the specied

refrigerant (R32) such as air. Any presence of air or other

foreign substance in the refrigerant circuit can cause an

abnormal pressure rise or rupture, resulting in injury.

• Do not change the setting of the protection devices. If the

pressure switch, thermal switch, or other protection device

is shorted and operated forcibly, or parts other than those

specied by Daikin are used, re or explosion may occur.

• When installing or relocating the air conditioner, do not let

any other substances besides R32, such as air, enter the

refrigerant circuit.

The presence of air or foreign matter in the refrigerant

circuit causes an abnormal pressure rise, which may

result in equipment damage and even injury.

• Do not use means to accelerate the defrosting process (if

possible) or to clean, other than those recommended by

the manufacturer.

•

The appliance must be stored in a room without continuously

operating ignition sources (for example: open ames, an

operating gas appliance or an operating electric heater).

• Do not pierce or burn.

• Be aware that refrigerants may not contain an odor.

• Comply with national gas regulations.

CAUTION

• Do not touch the switch with wet ngers. Touching a switch

with wet ngers can cause electric shock.

•

Do not allow children to play on or around the unit to prevent injury.

• Wear adequate personal protective equipment (protective

gloves, safety glasses,…) when installing, maintaining or

servicing the system.

• The heat exchanger ns are sharp enough to cut. To avoid

injury, wear gloves or cover the ns while working around

them.

• Do not touch the refrigerant pipes during and immediately

after operation as the refrigerant pipes may be hot or

cold, depending on the condition of the refrigerant owing

through the refrigerant piping, compressor, and other

refrigerant cycle parts. Your hands may suffer burns or

frostbite if you touch the refrigerant pipes. To avoid injury,

give the pipes time to return to normal temperature or, if

you must touch them, be sure to wear proper gloves.

•

Install drain piping to ensure proper drainage. Improper drain

piping may result in water leakage and property damage.

• Insulate piping to prevent condensation.

• Be careful when transporting the product.

• Do not turn off the power immediately after stopping

operation. Always wait for at least 5 minutes before turning

off the power. Otherwise, water leakage may occur.

• Do not use a charging cylinder. Using a charging cylinder

may cause the refrigerant to deteriorate.

•

Refrigerant R32 in the system must be kept clean, dry, and tight.

(a) Clean and Dry -- Foreign materials (including mineral

oils such as SUNISO oil or moisture) should be

prevented from getting into the system.

(b)

Tight -- R32 does not contain any chlorine, does not

destroy the ozone layer, and does not reduce the earth’s

protection again harmful ultraviolet radiation. R32 can

contribute to the greenhouse effect if it is released.

Therefore take proper measures to check for the tightness

of the refrigerant piping installation. Read the chapter

Refrigerant Piping and follow the procedures.

• The outdoor unit is for R32. See the catalog for indoor

models that can be connected. Normal operation is not

possible when connected to non-compatible indoor units.

•

Remote controller (wireless kit) transmitting distance can be

shorter than expected in rooms with electronic uorescent

lamps (inverter or rapid start types). Install the indoor unit

far away from uorescent lamps as much as possible.

• Do not install the air conditioner or heat pump in the

following locations:

(a) Where a mineral oil mist or oil spray or vapor is

produced, for example, in a kitchen.

Plastic parts may deteriorate and fall off or result in

water leakage.

(b)

Where corrosive gas, such as sulfurous acid gas, is produced.

Corroding copper pipes or soldered parts may result in

refrigerant leakage.

Electromagnetic waves may disturb the operation of

the control system and cause the unit to malfunction.

(d)

Where ammable gas may leak, where there is carbon

ber, or ignitable dust suspension in the air, or where

volatile ammables such as thinner or gasoline are handled.

Operating the unit in such conditions can cause a re.

• Take adequate measures to prevent the outdoor unit

from being used as a shelter by small animals. Small

animals making contact with electrical parts can cause

malfunctions, smoke, or re. Instruct the user to keep the

area around the unit clean.

• Servicing shall be performed only as recommended by the

manufacturer and licensed or certied in their jurisdiction.

NOTE

•

The outdoor unit should be positioned where the unit and power

supply wires (breaker panel to outdoor unit) are at least 10ft (3m)

away from any televisions or radios. (The unit may cause interference

with the picture or sound.) Depending on the radio waves, a distance

of 10ft (3m) may not be sufcient to eliminate the noise.

• Dismantling the unit, treatment of the refrigerant, oil and

additional parts must be done in accordance with the

relevant local, state, and national regulations.

• Only use tools for R32 or R410A, such as a gauge

manifold, charge hose, gas leak detector, reverse ow

check valve, refrigerant charge base, vacuum gauge, or

refrigerant recovery equipment.

• If the conventional refrigerant and refrigerator oil are

mixed in R32, the refrigerant may deteriorate.

•

As maximum allowable pressure is 604psi (4.17MPa), the wall

thickness of eld-installed pipes should be selected in accordance

with the relevant local, state, and national regulations.

RN004(R32)-U

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Accessories

ADrain socket

This is at the bottom of the packaging.

BDrain cap (1)

CDrain cap (2)

DRefrigerant charge label

2lb

+ =

2lb

1lb

EInstallation manual 1 FGeneral safety considerations 1

GWarranty 1

Precautions for Selecting a Location

1) Choose a place solid enough to bear the weight and vibration of the unit, where the operating sound will not be amplied.

2) Choose a location where the air discharged from the unit or the operating sound will not cause a nuisance to the neighbors of

the user.

3) Avoid locations, such as near bedrooms, where the operating sound may cause disturbance.

4) There must be sufcient space to carry the unit into and out of the site.

5) There must be sufcient space for air passage and no obstructions around the air inlet and the air outlet.

6) The site must not be prone to ammable gas leaks in the surrounding area.

7) In coastal areas or other places with a salty atmosphere or one containing sulfate gas, corrosion may shorten the life of the air

conditioner.

8) Since water will ow from the drain of the outdoor unit, do not place anything under the unit which must be kept away from

moisture.

NOTE

Cannot be installed suspended from a ceiling or stacked.

CAUTION

When operating the air conditioner in a low outdoor ambient temperature, be sure to

follow the instructions described below.

• To prevent exposure to wind, install the outdoor unit with its suction side facing the

wall.

• Never install the outdoor unit at a site where the suction side may be exposed

directly to wind.

• To prevent exposure to wind, it is recommended to install a bafe plate on the air

discharge side of the outdoor unit.

• In heavy snow areas, select an installation site where the snow will not affect the unit.

• If there is a likelihood of snow accumulating on the outdoor unit, attach a snow

protection hood.

• In high humidity areas or heavy snow areas, it is recommended to attach a drain pan

heater to prevent ice build-up from the bottom frame.

• Construct a large canopy.

• Construct a pedestal.

Install the unit high enough off

the ground to prevent burying

in snow.

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Precautions on Installation

• Check the strength and level of the installation surface so that the unit does not cause

any operating vibrations or noise after installation.

• Fix the unit in place securely using foundation bolts, as in the gure. (Prepare 4

sets of 5/16 inch (M8) or 3/8 inch (M10) foundation bolts, nuts and washers; all sold

separately.)

• It is best to screw in the foundation bolts until their ends are 3/4 inch (20mm) from the

foundation surface.

3/4”

(20mm)

Outdoor Unit Installation Diagram

RXM18∗RXM24∗

Max. allowable piping length 98-1/2ft (30m)

** Min. allowable piping length 10ft (3m)

Max. allowable piping height 82-1/64ft (25m)

*Additional refrigerant required for refrigerant

pipe exceeding 49.2ft (15m) in length. 0.22oz/ft (20g/m)

Gas pipe O.D. 1/2 inch

(12.7mm)

O.D. 5/8 inch

(15.9mm)

Liquid pipe O.D. 1/4 inch (6.4mm)

Refrigerant piping must be kept to a minimum.

* Be sure to add the proper amount of additional refrigerant.

Failure to do so may result in reduced performance.

** The suggested shortest pipe length is 10ft (3m), in order to avoid

noise from the outdoor unit and vibration.

(Mechanical noise and vibration may occur depending on how

the unit is installed and the environment in which it is used.) Allow 11-13/16 (300)

of work space below

the ceiling surface.

4-15/16 (125)

(From unit’s side)

23-5/8 (600)

(Foot bolt-hole centers)

13-5/8

(346)

(Foot bolt-hole

centers)

unit : inch (mm)

If there is a danger of the unit falling or overturning,

x the unit with foundation bolts, or with wire or

other means.

CAUTION

Keep the piping length between

10ft (3m) and 98-1/2ft (30m).

Refrigerant piping must be protected from

physical damage.

Install a plastic cover or equivalent.

If strong wind blows into the air

discharge side from the front and

there is a danger that the fan may be

damaged, change the orientation of

the air discharge side of the outdoor

unit or use an air direction adjustment

grille (sold separately).

Wrap the insulation pipe with

nishing tape from bottom to top.

9-13/16 (250) from wall

Allow space for piping and

electrical servicing.

How to remove the stop

valve cover

1) Remove the screw on the

stop valve cover.

2) Slide the stop valve cover

downward to remove it.

How to attach the stop valve

cover

1) Insert the upper part of the

stop valve cover into the

outdoor unit.

2) Tighten the screw.

Stop valve cover

In sites with poor drainage, use

block bases for the outdoor unit.

Adjust foot height until the unit is

level. Otherwise, water leakage or

pooling of water may occur.

Refrigerant charge label

Please ll in with indelible ink,

1 the factory refrigerant charge of the product,

2 the additional refrigerant amount charged in the eld and

1 + 2 the total refrigerant charge

on the refrigerant charge label supplied with the product.

Afx the refrigerant charge label near the manufacturer’s label

after lling it out.

The lled out label must be adhered in the

proximity of the product charging port.

2lb

+ =

2lb

1lb

1 factory refrigerant charge of the

product: see unit name plate

2 additional refrigerant amount

charged in the eld

3 total refrigerant charge

4 outdoor unit

5 refrigerant cylinder and manifold

for charging

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Installation Space Requirements

•

Position the unit on a horizontal surface.

Any tilt in the unit should be 3° or less to the horizontal.

•

Where a wall or other obstacle is in the path of the outdoor unit’s intake or exhaust airow, follow the installation space

requirements below.

• For any of the below installation patterns, the wall height on the outlet side should be 47-1/4 inch (1200mm) or less.

Wall facing one side

Walls facing three sides

Walls facing two sides

More than

3-15/16 (100)

More than

13-3/4 (350)

More than

1-15/16 (50)

Side view

Top view

unit: inch (mm)

More than 3-15/16 (100)

More than 13-3/4 (350)

47-1/4

(1200)

or less

More than

3-15/16 (100)

More than

13-3/4

(350)

More than

1-15/16 (50)

than

3-15/16

(100)

More than

1-15/16 (50)

More than

13-3/4 (350)

When installed as in the gure on the left, it is recommended to either

change the orientation of the outdoor unit outlet side or use the air direction

adjustment grille (sold separately).

Outdoor Unit Installation

1. Installing the outdoor unit

• When installing the outdoor unit, refer to “Precautions for Selecting a Location” and the “Outdoor Unit Installation

Diagram”.

• If drain work is necessary, follow the procedures in

“

2. Drain work

”

2. Drain work

CAUTION

• In cold areas, do not use a drain socket, drain caps (1, 2) and a drain hose with the outdoor unit. (Drain water may freeze,

impairing heating performance.)

• If the drain port is covered by a mounting base or oor

surface, place additional foot bases of at least 1-1/4

inch (30mm) in height under the outdoor unit’s feet.

1) Attach B drain cap (1) and C drain cap (2).

2) Attach A drain socket.

• When attaching A drain socket to the bottom

frame, make sure to connect the drain hose to the

drain socket rst.

A Drain socket

Bottom frame

Hose (available commercially,

inner dia. 5/8” (16mm))

Bottom frame

Drain cap

Pinch the bottom

frame in.

C Drain cap (2)

B Drain cap (1)

Air outlet side

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3. Flaring the pipe end

WARNING

• Do not apply mineral oil to the are.

• Prevent mineral oil from getting into the system as this would reduce the service life of the units.

• Never use piping which has been used for previous installations. Only use parts which are delivered with this unit.

• Never install a dryer to this R32 unit in order to guarantee its service life.

• The drying material may dissolve and damage the system.

• Improper aring may result in refrigerant gas leakage.

CAUTION

• Do not reuse joints which have been used once already.

1) Cut the pipe end with a pipe cutter.

2) Remove burrs with the cut surface facing

downward, so that the lings do not enter the

pipe.

3) Put the are nut on the pipe.

4) Flare the pipe.

5) Check that the aring has been done correctly.

Cut exactly at

right angles.

Remove

burrs.

The are’s inner

surface must be

aw-free.

The pipe end must

be evenly ared in a

perfect circle.

Make sure that the

are nut is tted.

When aring, do

not over-tighten and

crack.

Check

Set exactly at the position shown below.

Die

Flare tool for

R32 or R410A Conventional are tool

Clutch-type Clutch-type

(Rigid-type)

Wing-nut type

(Imperial-type)

A0-0.020 inch

(0-0.5mm)

0.039-0.059 inch

(1.0-1.5mm)

0.059-0.079 inch

(1.5-2.0mm)

Flaring

4. Refrigerant piping

CAUTION

• Use the are nut xed to the main unit. (This is to prevent the are nut from cracking as a result of deterioration over time.)

• To prevent gas leakage, apply refrigeration oil only to the inner surface of the are. (Use refrigeration oil for R32 or R410A.)

• Use a torque wrench when tightening the are nuts to prevent damage to the are nuts and gas leakage.

• Align the centers of both ares and tighten the are nuts 3 or 4 turns by hand, then tighten them fully with a spanner and a

torque wrench.

Apply oil

Do not apply refrigeration

oil to the outer surface.

Do not apply refrigeration

oil to the are nut to

avoid tightening with

excessive torque.

Apply refrigeration

oil only to the inner

surface of the are.

Flare nut

Tighten

Torque wrench

Spanner

Piping union

Flare nut

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Outdoor Unit Installation

Flare nut tightening torque

Gas side Liquid side

1/2 inch (12.7mm) 5/8 inch (15.9mm) 1/4 inch (6.4mm)

36-1/2–44-1/2lbf • ft

(49.5-60.3N • m)

45-5/8–55-5/8Ibf • ft

(61.8-75.4N • m)

10-1/2 – 12-3/4Ibf • ft

(14.2-17.2 N • m)

Width across ats 11/16 inch (17mm) 1-1/16 inch (27mm) 1-3/16 inch (30mm)

Valve cap

tightening torque

10-1/2 – 12-5/8lbf • ft

(14.2-17.2N • m)

35-3/8–44-1/8lbf • ft

(48.0-59.8N • m)

16-5/8–20-1/4Ibf • ft

(22.5-27.5N • m)

Service port cap tightening torque

8 – 10-7/8lbf • ft (10.7-14.7N • m)

Cautions on pipe handling

• Protect the open end of the pipe from dust and moisture.

• All pipe bends should be as gentle as possible. Use a pipe bender for bending.

Selection of copper and heat insulation materials

When using commercial copper pipes and ttings, observe the following:

• Insulation material: Polyethylene foam

Heat transfer rate: 0.041 to 0.052W/mK (0.024 to 0.030Btu/fth°F (0.035 to

0.045kcal/mh°C))

Be sure to use insulation that is designed for use with HVAC Systems.

• ACR Copper only.

• Be sure to insulate both the gas and liquid piping and observe the insulation

dimensions as below.

Be sure to

place a cap.

Wall

Rain If no are cap

is available,

cover the are

mouth with tape

to keep dirt and

water out.

Piping size Minimum bend radius Piping thickness Thermal insulation size Thermal insulation

thickness

Gas side

O.D. 1/2 inch

(12.7mm)

1-9/16 inch (40mm)

or more

0.031 inch (0.8mm)

(C1220T-O)

I.D. 9/16-5/8 inch

(14-16mm)

13/32 inch

(10mm) Min.

O.D. 5/8 inch

(15.9mm)

1-15/16 inch (50mm)

or more

0.039 inch (1.0mm)

(C1220T-O)

I.D. 5/8-13/16 inch

(16-20mm)

Liquid side O.D. 1/4 inch

(6.4mm)

1-3/16 inch (30mm)

or more

0.031 inch (0.8mm)

(C1220T-O)

I.D. 5/16-13/32 inch

(8-10mm)

• Use separate thermal insulation pipes for gas and liquid refrigerant pipes.

• Using nishing tape, bundle and wrap the indoor unit piping and drain hose

together so that the drain hose is below the other piping.

Finishing tape

Gas pipe

Drain hose

Liquid pipe

insulation

Gas pipe

insulation

5. Pressure test and evacuating system

WARNING

• Make sure that air or any matter other than refrigerant (R32) does not get into the refrigeration cycle.

• If refrigerant gas leaks should occur, ventilate the room as soon and as much as possible.

• R32, as well as other refrigerants, should always be recovered and never be released directly into the environment.

• Use tools for R32 or R410A (such as the gauge manifold, charging hose, or vacuum pump adapter).

CAUTION

• It is highly recommended that you do not open/close the stop valves when the outdoor temperature is below −5°F (−21°C)

as this may result in refrigerant leakage.

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• When piping work is complete, it is necessary to perform a pressure test

and evacuate system with a vacuum pump.

• If using additional refrigerant, purge the air from the refrigerant pipes and

indoor unit using a vacuum pump, then charge additional refrigerant.

• Use a hexagonal wrench (3/16 inch (4mm)) to operate the stop valve rod.

• All refrigerant pipe joints should be tightened with a torque wrench to the

specied tightening torque.

Compound

pressure gauge Pressure

meter

High-pressure

valve

Gauge

manifold

Low-pressure

valve

Charging

hoses

Vacuum pump Service port

Valve caps

Liquid

stop

valve

Gas stop valve

1) Pressurize the liquid pipe and gas pipe from the service ports of each stop valve to 604psi (4.17MPa) (do not pressurize

more than 604psi (4.17MPa)) for 1 hour minimum, 24 hours recommended. If there is a pressure drop, check for leaks,

make repairs and perform the pressure test again.

2) Connect the gauge manifold’s charging hose to the gas stop valve’s service port.

3) Fully open the low-pressure valve (Lo) on the gauge manifold and fully close the high-pressure valve (Hi).

(High-pressure valve will require no further operation.)

4) Evacuate system using vacuum pump to below 500 microns for 1 hour minimum.

5) Close the low-pressure valve (Lo) on the gauge manifold and stop vacuum pumping.

(Maintain this condition for a few minutes to make sure that the compound pressure gauge pointer does not swing

back.)*1

6) Remove the valve caps from the liquid stop valve and gas stop valve.

7) To open the liquid stop valve, turn the rod of the valve 90° counter-clockwise using a hexagonal wrench.

Close it after 5 seconds, and check for gas leakage.

Using soapy water, check for gas leakage from the indoor unit’s are and outdoor unit’s are and valve rods.

After the check is complete, wipe all soapy water off.*2

8) Disconnect the charging hoses from the service port for the gas stop valve, then fully open the liquid and gas stop valves.

(Do not attempt to turn the valve rods further than they can go.)

9) Tighten the valve caps and service port caps for the liquid and gas stop valves with a torque wrench to the specied

torques.

Refer to “4. Refrigerant piping” on page 6 for details.

*1 If the compound pressure gauge pointer swings back, the refrigerant may have water content or there may be a loose

pipe joint.

Check all pipe joints and retighten nuts as needed, then repeat steps 3) through 5).

*2 Under no circumstances shall potential sources of ignition be used in the searching for or detection of

refrigerant leaks.

A halide torch (or any other detector using a naked ame) shall not be used.

Do not use substances containing chlorine and electronic leak detection for gas leak detection.

English

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9■English

Wiring

WARNING

• Do not use tapped wires, extension cords, or starburst connections, as they may cause overheating, electric shock, or re.

• Do not use locally purchased electrical parts inside the product. (Do not branch the power for the drain pump, etc., from the

terminal block.) Doing so may cause electric shock or re.

• The circuit must be protected with safety devices in accordance with local and national codes, i.e. a circuit breaker.

• Use an all-pole disconnection type circuit breaker with at least 1/8 inch (3mm) between the contact point gaps.

• When carrying out wiring, take care not to pull at the conduit.

• Do not connect the power wire to the indoor unit. Doing so may cause electric shock or re.

CAUTION

Precautions to be taken for power supply wiring

• When connecting the inter-unit wires to the terminal block using a single core wire, be sure to curl the end of the lead.

Improper work may cause heat and re.

Good

Stripping wire at terminal block

Wrong

Strip wire end

to this point.

Excessive strip length

may cause electric shock

or current leakage.

• If the stranded wires must be used, make sure to use the round crimp-

style terminal for connection to the power supply terminal block. Place

the round crimp-style terminals on the wires up to the covered part and

secure in place.

Round crimp-style

terminal

Stranded wire

Screw

Flat washer Screw Screw

Flat washer

Good Wrong

Round

crimp-style

terminal

Round crimp-style

terminal

Round crimp-style

terminal

Arrow view A

• Do not turn on the circuit breaker until all work is completed.

1) Strip the insulation from the wire (3/4 inch (20mm)).

2) Connect the inter-unit wires between the indoor and outdoor units so that the terminal numbers match. Tighten the

terminal screws securely. It is recommended that a slot-head screwdriver be used to tighten the screws.

1 2 3

Recommend using AWG12, stranded and insulated

wire for connections between indoor and outdoor units.

Local code always supersedes recommendation.

Firmly x the wires with

the terminal screws.

Indoor

unit

Outdoor

unit

Ground

Firmly x the wires with

the terminal screws.

Power supply

60Hz 208-230V

20A

Follow local codes

for wiring and safety

devices between

outdoor unit and power

source.

NOTE

Take care to ensure that all wiring between indoor unit and outdoor unit has a consistent connection. Any splices can cause

communication errors.

01_EN_3P628775-3.indd 9 2021/02/09 13:40:06

10■English

[Method of mounting conduit]

1) Dismount the service lid by removing the 2 screws.

2) Pass wires through the conduit and secure them with a lock nut.

3) After completing the work, reattach the service lid to its original position.

L1L2

1 2 3

Terminal block

Shape wires so that the

conduit mounting plate ts

securely.

For power supply

Lock nut

Conduit

mounting

plate

Service lid

Screws

Facility Setting

(cooling at low outdoor temperature)

WARNING

• Make sure to turn the power OFF before removing the service lid.

CAUTION

• If the outdoor unit is installed where the heat exchanger of the unit is exposed to direct wind, provide a windbreak wall.

• Intermittent noises may be produced by the indoor unit due to the outdoor fan turning on and off when using facility settings.

• Do not place humidiers or other items which might raise the humidity in rooms where facility settings are being used.

A humidier might cause dew condensation from the indoor unit outlet vent.

• Activating the facility setting sets the indoor fan tap to the highest position.

Notify the user about this.

This function is designed for facilities such as equipment or computer rooms. It is never to be used in a

residence or ofce where people occupy the space.

1) Turning on SW5-3 on the PCB will extend the operation range to 14°F (–10°C).

Installing an air direction adjustment grille (sold separately) will further extend the operation range to –4°F (–20°C). In these

cases, the unit will stop operating if the outdoor temperature falls below –4°F (–20°C), restarting once the temperature rises

above this level.

PCB

HEAT

COOL

OFF

SW5

Turn on

switch 3

Screw

Remove

the switch

cover

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11 ■English

When attaching the drain pan heater

In high humidity areas or heavy snow areas, it is recommended to attach a drain pan heater to

prevent ice build-up from the bottom frame.

1) Attach the drain pan heater in accordance with the installation manual included with the drain pan heater.

2) Dismount the service lid by removing the 2 screws.

3) Remove the switch cover (1 screw).

4) Turn on SW6-1 on the PCB.

PCB

HEAT

COOL

OFF

SW6

1 2

Turn on

switch 1

Screw

Remove

the switch

cover

Pump Down Operation

In order to protect the environment, be sure to pump down when relocating or disposing of the unit.

1) Remove the valve cap from the liquid stop valve and gas stop valve.

2) Begin forced cooling operation.

3) After 5 to 10 minutes, close the liquid stop valve with a hexagonal wrench.

4) After 2 to 3 minutes, close the gas stop valve and stop forced cooling operation.

5) Attach the valve cap once procedures are complete.

Liquid

stop valve

Hexagonal

wrench

Valve cap

Gas

stop valve

Forced cooling operation

Using the indoor unit ON/OFF switch

Press the indoor unit ON/OFF switch for at least 5 seconds. (The operation will start.)

• Forced cooling operation will stop automatically after about 15 minutes.

To stop the operation, press the indoor unit ON/OFF switch.

Using the indoor unit’s remote controller

1) Press and select the COOL operation.

2) Press to turn on the system.

3) Press , and at the same time.

4) Press , select “ ”, and press for conrmation.

• Forced cooling operation will stop automatically after about 30 minutes. To stop the operation, press .

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12■English

Trial Operation and Testing

• When trial operation is conducted directly after the circuit breaker is turned on, in some cases no air will be output for about 15

minutes in order to protect the air conditioner.

1. Trial operation and testing

Refer to the installation manual for the indoor unit.

2. Test items

Test items Symptom Check

Indoor and outdoor units are installed securely. Fall, vibration, noise

No refrigerant gas leaks. Incomplete cooling/heating function

Refrigerant gas and liquid pipes and indoor drain hose extension are

thermally insulated. Water leakage

Draining line is properly installed. Water leakage

System is properly grounded. Electrical leakage

The specied wires are used for inter-unit wiring. No operation or burn damage

Indoor or outdoor unit’s air inlet or air outlet are unobstructed. Incomplete cooling/heating function

Stop valves are opened. Incomplete cooling/heating function

Indoor unit properly receives remote control commands. No operation

English

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The two-dimensional bar code

is a manufacturing code.

3P628775-3 M20B075 (2102) HT

00_CV_3P628775-3.indd 2 2021/02/01 10:48:46

Daikin RXM18VVJU User manual

Brand: Daikin

Model: RXM18VVJU

Category: Split-system air conditioners

Type: User manual

Powerful Cooling and Heating: Delivers efficient cooling during hot summers and provides reliable heating during cold winters, maintaining a comfortable indoor climate year-round.
Energy-Saving Operation: Utilizes energy-efficient technology to minimize power consumption while delivering effective cooling and heating performance.
Quiet Operation: Operates quietly, ensuring minimal noise disturbance, making it suitable for bedrooms, offices, and other noise-sensitive environments.

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Daikin RXM18VVJU User manual

Daikin RXM18VVJU User manual

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